. () , , .
, , , ,
, . , , .
.
1. g, F, , d, , M Îg F M d (.. M Îg).
e =½ MF ½/½ MM ¢½ . e, . 0<e<1 . e , . e=1 , , , : .
e, . 1<e<¥ .
, ½ FF ¢½ . , , . e , . e,
F d, . , .
2. , (2) (4), c/a, F 1(c, 0), F 2( c, 0),
d1: x =, d2: x =
(, c 2 = a 2 b 2 , c 2 = a 2 + b 2 ).
, ,
1 2, , . , -, .
. , .
- . p =½ FF ¢½ . FF ¢ Ox . Oy . F (p/ 2, 0), d: x = p/ 2.
M (x, y) .
½ MF ½ =, ½ MM ¢½ = x +.
½ MF ½ 2 =½ MM ¢½ 2 Û 2+ y 2 =2 Û
y 2 = 2 px. (6)
, M (x, y) (6),
½ MF ½ 2 = 2+ y 2 = x 2 px + +2 px = x 2 + px + = 2=½ MM ¢½ 2
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(6) .
.
1. x ³ 0.
2. M (x, y)Î g, .. (x, y) (6), (x, y), M Ox. Ox . .
3. O, .
, , .
, l, O, Oy y = kx. , g
y 2 = 2 px, k 2 x 2 2 px = 0, x (k 2 x 2 p) = 0,
y = kx. y = kx. y = kx.
k ¹ 0 (0, 0) 2, k = 0 (0, 0). k = 0 Ox.
, , , , , , , .
.
, , , . , " M Îg, MF 1 MF 2 M . , , , .
, , , . , , , , . , .